Modeling structures for electromagnetic shielding information and telecommunication systems

2012 ◽  
Vol 16 (5) ◽  
pp. 82-85
Author(s):  
A.V. Machulyanskij ◽  
V.A. Machulyanskij ◽  
V.V. Pilinskij ◽  
O.V. Telichkina
Keyword(s):  
Electromagnetic Field ◽  
Multilayer Structure ◽  
Electromagnetic Shielding ◽  
Low Resistivity ◽  
Telecommunication Systems ◽  
Nanocomposite Structures

A model of a multilayer structure for shieldingelectromagnetic field. It is shown that by usingmultilayer nanocomposite structures with highmagnetic permeability and low resistivity can beachieved increasing the values of efficiency ofshielding electromagnetic field

Effect of different photoinitiators on the properties of UV-cured electromagnetic shielding composites

2015 ◽  
Vol 35 (3) ◽  
pp. 209-222 ◽  
Author(s):  
Yuting Dai ◽  
Fengxian Qiu ◽  
Lili Wang ◽  
Jinliang Zhao ◽  
Dongya Yang ◽  
...  
Keyword(s):  
Electromagnetic Shielding ◽  
Conductive Network ◽  
Surface Functional Groups ◽  
Low Resistivity ◽  
Polyurethane Acrylate ◽  
Potential Applications ◽  
Different Content ◽  
Conductive Particles ◽  
Shielding Composites ◽  
Active Diluents

Abstract A series of UV-cured electromagnetic shielding composites (UV-EMSC) containing different content of graphene oxide (GO) were prepared with oligomer, acrylate active diluents and different photoinitiators (Darocur 1173, Irgacure 184 or Irgacure 651). To fabricate conductive oligomer with low resistivity, polyurethane-acrylate (PUA) was used as the polymer matrix to help construct two-dimensional conductive networks consisting of GO. For forming conductive network structure, the surface functional groups (-OH, -COOH) of GO served as slightly conductive particles bonded with -NCO from the chain of polyurethane. The UV-EMSC exhibited a low resistivity of approximately 402 Ω·cm and an outstanding enhanced electrical conductivity of 249 mS/m at a GO content of 0.0200%. The effects of different photoinitiators on the properties of UV-cured films were investigated. The results indicate that the prepared UV-EMSC has great potential applications in different regions, such as in coatings of electronic, electrical, communications, plastic coatings and wood finishes.

The effect of electromagnetic shielding on phantom limb pain: A placebo-controlled double-blind crossover trial

2015 ◽  
Vol 40 (3) ◽  
pp. 350-356 ◽  
Author(s):  
Keren Fisher ◽  
Sarah Oliver ◽  
Imad Sedki ◽  
Rajiv Hanspal
Keyword(s):  
Electromagnetic Field ◽  
Electromagnetic Fields ◽  
Crossover Trial ◽  
Phantom Limb Pain ◽  
Well Being ◽  
Electromagnetic Shielding ◽  
Phantom Limb ◽  
Phantom Pain ◽  
Limb Pain ◽  
Double Blind

Background: Environmental electromagnetic fields influence biological systems. Evidence suggests these have a role in the experience of phantom limb pain in patients with amputations. Objectives: This article followed a previous study to investigate the effect of electromagnetic field shielding with a specially designed prosthetic liner. Study design: Randomised placebo-controlled double-blind crossover trial. Methods: Twenty suitable participants with transtibial amputations, phantom pain at least 1 year with no other treatable cause or pathology were requested to record daily pain, well-being, activity and hours of prosthetic use on pre-printed diary sheets. These were issued for three 2-week periods (baseline, electromagnetic shielding (verum) and visually identical placebo liners – randomly allocated). Results: Thirty-three per cent of the recruited participants were unable to complete the trial. The resulting N was therefore smaller than was necessary for adequate power. The remaining data showed that maximum pain and well-being were improved from baseline under verum but not placebo. More participants improved on all variables with verum than placebo. Conclusion: Electromagnetic field shielding produced beneficial effects in those participants who could tolerate the liner. It is suggested that this might be due to protection of vulnerable nerve endings from nociceptive effects of environmental electromagnetic fields. Clinical relevance Electromagnetic field shielding with a suitable limb/prosthesis interface can be considered a useful technique to improve pain and well-being in patients with phantom limb pain.

Optimization of lowermost layer material for low-resistivity Ag-based multilayer structure in low-emissivity glass

2021 ◽  
pp. 138996
Author(s):  
Koji Mizukoshi ◽  
Takafumi Yamamura ◽  
Yasuhiro Tomioka ◽  
Midori Kawamura
Keyword(s):  
Multilayer Structure ◽  
Layer Material ◽  
Low Resistivity

scholarly journals Effect of moisture content on the electromagnetic shielding ability of non-conductive textile structures

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Sundaramoorthy Palanisamy ◽  
Veronika Tunakova ◽  
Jiri Militky ◽  
Jakub Wiener
Keyword(s):  
Electromagnetic Field ◽  
Moisture Content ◽  
Electromagnetic Shielding ◽  
The Body ◽  
Shielding Effectiveness ◽  
Electrically Conductive ◽  
Drying Time ◽  
Textile Materials ◽  
Conductive Textile ◽  
Electromagnetic Shielding Effectiveness

AbstractElectromagnetically shielding textile materials, especially in professional or ordinary clothing, are used to protect an implanted pacemaker in the body. Alternatively, traditional textiles are known for their non-conductivity and transparency to an electromagnetic field. The main goal of this work was to determine whether the high moisture content (sweat) of the traditional textile structure significantly affects the resulting ability of the material to shield the electromagnetic field. Specifically, whether sufficient wetting of the traditional textile material can increase its electrical conductivity to match the electrically conductive textiles determined for shielding of the electromagnetic field. In this study, cotton and polyester knitted fabric samples were used, and two liquid medias were applied to the samples to simulate human sweating. The experiment was designed to analyse the factors that have a significant effect on the shielding effectiveness that was measured according to ASTM D4935. The following factors have a significant effect on the electromagnetic shielding effectiveness of moisturised fabric: squeezing pressure, drying time and type of liquid media. Additionally, the increase of electromagnetic shielding was up to 1 dB at 1.5 GHz frequency at the highest level of artificial sweat moisturised sample.

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